Optical composite film, display panel and display device

ABSTRACT

An optical composite film includes a reflection grating film layer, an optically-uniaxial optical film layer, and a substrate layer. The optically-uniaxial optical film layer includes a plate-shaped portion and a plurality of refraction portions, where the plate-shaped portion is stacked on the reflection grating film layer, the plurality of refraction portions is disposed on a side of the plate-shaped portion away from the reflection grating film layer, and the plurality of refraction portions is selected from one type of camber columns and quadrangular prisms; and the substrate layer is stacked on a side of the plate-shaped portion close to the refraction portion, where the plurality of refraction portions is accommodated in the substrate layer, and a refractive index of the substrate layer is less than an extraordinary light refractive index of the optically-uniaxial optical film layer.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Stage application of, and claimspriority to, PCT/CN2018/118220, filed Nov. 29, 2018, which furtherclaims priority to Chinese Patent Application No. 201811278705.4, filedOct. 30, 2018, the entire contents of which are incorporated herein intheir entirety.

TECHNICAL FIELD

This application relates to the field of display technologies, and moreparticularly relates to an optical composite film, a display panel, anda display device.

BACKGROUND

Exemplary large-sized liquid crystal display (LCD) panels include avertical alignment (VA) liquid crystal panel, an in-plane switching(IPS) liquid crystal panel, and the like. Compared with the IPS liquidcrystal panel, the VA liquid crystal panel has advantage of relativelyhigh production efficiency and low manufacturing costs, but hasrelatively obvious defects in optical properties. Particularly, alarge-sized panel requires a relatively large viewing angle forpresentation in commercial application, and at a large viewing angle,the brightness of the VA liquid crystal panel is rapidly saturated alongwith the voltage. As a result, the picture quality, the contrast, andthe color shift at the viewing angle are deteriorated severely comparedwith the front picture quality, and a color shift problem is generated.

In addition, an architecture of an exemplary LCD display panel isusually a stacking structure. To be specific, polarizing plates areattached on and under a liquid crystal layer. However, a single-layeredthickness of a current polarizing plate is approximately 200 μm, and theupper and lower polarizing plates need to be 400 μm in total thickness.As a result, the liquid crystal display panel is relatively thick.

SUMMARY

This application provides an optical composite film that can improvecolor shift of a display panel at a large viewing angle and make thedisplay panel relatively thin.

Moreover, a display panel and a display device are further provided.

An optical composite film comprises:

a reflection grating film layer;

an optically-uniaxial optical film layer, comprising a plate-shapedportion and a plurality of refraction portions, wherein the plate-shapedportion is stacked on the reflection grating film layer, the pluralityof refraction portions is disposed on a side of the plate-shaped portionaway from the reflection grating film layer, the plurality of refractionportions is selected from one type of camber columns and quadrangularprisms, and when the plurality of refraction portions is the cambercolumns, the refraction portion has a plurality of side surfaces, one ofthe plurality of side surfaces is an arc-shaped convex surface, and aside surface of the refraction portion away from the arc-shaped convexsurface is laminated to the plate-shaped portion; and when the pluralityof refraction portions is the quadrangular prisms, a side surface of therefraction portion is laminated to the plate-shaped portion; and

a substrate layer, stacked on a side of the plate-shaped portion closeto the refraction portion, wherein the plurality of refraction portionsis accommodated in the substrate layer, and a refractive index of thesubstrate layer is less than an extraordinary light refractive index ofthe optically-uniaxial optical film layer.

In an embodiment, the extraordinary light refractive index of theoptically-uniaxial optical film layer is greater than an ordinary lightrefractive index of the optically-uniaxial optical film layer.

In an embodiment, the substrate layer is a transparent optical filmlayer having optical isotropy.

In an embodiment, a material of the optically-uniaxial optical filmlayer is a nematic-phase liquid crystal molecule material.

In an embodiment, the substrate layer is selected from one of apolymethylmethacrylate layer, a polyethylene terephthalate layer, acyclic olefin polymer layer, a cellulose triacetate film, a polyimidefilm, a silicon dioxide layer, a silicon nitride layer, and a glassplate layer.

In an embodiment, the extraordinary light refractive index of theoptically-uniaxial optical film layer is 1.0 to 2.5.

In an embodiment, the refractive index of the substrate layer is 1.0 to2.5.

In an embodiment, a difference between the extraordinary lightrefractive index of the optically-uniaxial optical film layer and therefractive index of the substrate layer is 0.01 to 2.

In an embodiment, the arc-shaped convex surface is a curved surfacedisposed when a circular arc line is moved along an extension directionof the refraction portion.

In an embodiment, the plurality of refraction portions is the cambercolumns, the plurality of refraction portions is arranged along astraight line, and extension directions of the plurality of refractionportions are parallel.

In an embodiment, the plurality of refraction portions is the cambercolumns, the plurality of refraction portions is arranged in atwo-dimensional matrix, and two neighboring refraction portions aredisposed at an interval.

In an embodiment, the plurality of refraction portions is thequadrangular prisms, the plurality of refraction portions is arrangedalong a straight line, extension directions of the plurality ofrefraction portions are parallel, and two neighboring refractionportions are disposed at an interval.

In an embodiment, the plurality of refraction portions is thequadrangular prisms, the plurality of refraction portions is arranged ina two-dimensional matrix, and two neighboring refraction portions aredisposed at an interval.

In an embodiment, the reflection grating film layer comprises atransparent substrate and a plurality of strip-shaped metal layersdisposed on the transparent substrate, the plurality of metal layers isevenly arranged at intervals along a straight line, and extensiondirections of the plurality of metal layers are parallel to each other.

A display panel comprises a metal grating film layer, a first glass filmlayer, a first indium tin oxide film layer, a liquid crystal layer, asecond indium tin oxide film layer, the foregoing optical compositefilm, a second glass film layer, and a photoresist layer, wherein themetal grating film layer, the first glass film layer, the first indiumtin oxide film layer, the liquid crystal layer, the second indium tinoxide film layer, the reflection grating film layer, theoptically-uniaxial optical film layer, the substrate layer, and thesecond glass film layer are sequentially stacked, and the photoresistlayer is stacked between the substrate layer and the second glass filmlayer, or the photoresist layer is stacked between the first glass filmlayer and the first indium tin oxide film layer.

A display device comprises a backlight source and the foregoing displaypanel, wherein the backlight source is located on a side of the displaypanel.

Details of one or more embodiments of this application are provided inthe following accompanying drawings and descriptions. Other features,objectives, and advantages of this application will become apparent fromthe specification, the accompanying drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a display device accordingto Embodiment 1;

FIG. 2 is a schematic structural diagram of a backlight source of thedisplay device shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a display panel of thedisplay device shown in FIG. 1;

FIG. 4 is a schematic structural diagram of a reflection grating filmlayer in an optical composite film of the display panel shown in FIG. 3;

FIG. 5 is a schematic structural diagram of an optical composite film,at another angle, of the display panel shown in FIG. 3;

FIG. 6 is a schematic structural diagram of an optical composite film,at another angle, of another implementation of the display panel shownin FIG. 3;

FIG. 7 is a schematic structural diagram of an optically-uniaxialoptical film layer in the optical composite film shown in FIG. 5;

FIG. 8 is a schematic structural diagram of an optical composite film,at another angle, of another implementation of the display panel shownin FIG. 3;

FIG. 9 is a schematic structural diagram of an optical composite film,at another angle, of another implementation of the display panel shownin FIG. 3;

FIG. 10 is a schematic structural diagram of an optically-uniaxialoptical film layer in the optical composite film shown in FIG. 8;

FIG. 11 is a schematic structural diagram of an optically-uniaxialoptical film layer of another implementation of the optical compositefilm shown in FIG. 8;

FIG. 12 is a schematic structural diagram of the optically-uniaxialoptical film layer, at another angle, shown in FIG. 11;

FIG. 13 is a schematic structural diagram of the optically-uniaxialoptical film layer, at another angle, shown in FIG. 11;

FIG. 14 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1;

FIG. 15 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1;

FIG. 16 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1;

FIG. 17 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1;

FIG. 18 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1;

FIG. 19 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1; and

FIG. 20 is a schematic structural diagram of a display panel of anotherimplementation of the display device shown in FIG. 1.

DETAILED DESCRIPTION OF THE EMBODIMENTS

This application provides an optical composite film, a display panel,and a display device. To make objectives, technical solutions, andeffects of this application clearer and more definite, this applicationis further described in detail below. It should be understood thatspecific embodiments described herein are only used to explain thisapplication and are not intended to limit this application.

Explanation of symbols: “>” means greater than; “<” means less than; “=”means equal.

Referring to FIG. 1, a display device 10 of an implementation includes abacklight source 100 and a display panel 200.

The backlight source 100 is a collimated light emitting backlight (BL)source, so that energy of light is centrally output at a front viewingangle.

Referring to FIG. 2, specifically, the backlight source 100 includes areflector plate 110, a light guide plate 120, a prism film 130, and alight-emitting diode (LED) light source 140. The reflector plate 110,the light guide plate 120, and the prism film 130 are sequentiallystacked, the light guide plate 120 has a light incident surface 121, andthe LED light source 140 and the light incident surface 121 are disposedopposite to each other. A side of the light guide plate 120 close to thereflector plate 110 is provided with a strip-shaped first groove 122,the first groove 122 has a V-shaped cross section, and an extensiondirection of the first groove 122 is perpendicular to a light emergentdirection of the LED light source 140. A side of the light guide plate120 close to the prism film 130 is provided with a strip-shaped secondgroove 123, the second groove 123 has a V-shaped cross section, and anextension direction of the second groove 123 is parallel to a lightemergent direction of the LED light source 140. Optionally, a side of aprism of the prism film 130 is stacked on the light guide plate 120.

Referring to FIG. 3, the display panel 200 includes a metal grating filmlayer 210, a first glass film layer 220, a first indium tin oxide (ITO)film layer 230, a liquid crystal layer 240, a second indium tin oxidefilm layer 250, an optical composite film 260, a second glass film layer270, and a photoresist layer 280.

The metal grating film layer 210 can turn natural light into polarizedlight, and is in place of a polarizing plate, to reduce the thickness ofthe display panel 200. The thickness of the metal grating film layer 210is usually less than 20 μm. It can be learned that, the thickness of themetal grating film layer 210 is far less than the thickness of thepolarizing plate.

The first glass film layer 220 is stacked on the metal grating filmlayer 210.

The first indium tin oxide film layer 230 is stacked on a side of thefirst glass film layer 220 away from the metal grating film layer 210.

The liquid crystal layer 240 is stacked on a side of the first indiumtin oxide film layer 230 away from the first glass film layer 220.

The second indium tin oxide film layer 250 is stacked on a side of theliquid crystal layer 240 away from the first indium tin oxide film layer230.

The optical composite film 260 is stacked on a side of the second indiumtin oxide film layer 250 away from the liquid crystal layer 240.Specifically, the optical composite film 260 includes a reflectiongrating film layer 261, an optically-uniaxial optical film layer 262,and a substrate layer 263.

The reflection grating film layer 261 is stacked on a side of the secondindium tin oxide film layer 250 away from the liquid crystal layer 240.The reflection grating film layer 261 can turn natural light intopolarized light, and is in place of a polarizing plate, to reduce thethickness of the display panel 200. The thickness of the reflectiongrating film layer 261 is usually less than 20 μm. It can be learnedthat, the thickness of the reflection grating film layer 261 is far lessthan the thickness of the polarizing plate.

Referring to FIG. 4, specifically, the reflection grating film layer 261includes a transparent substrate 261 a and a metal layer 261 b.

The transparent substrate 261 a is selected from one of a glasssubstrate, a silica gel substrate, a silicon dioxide substrate, asilicon nitride substrate, a polymethylmethacrylate substrate, and apolyethylene terephthalate substrate.

A plurality of metal layers 261 b exists and is strip-shaped, theplurality of metal layers 261 b is disposed on the transparent substrate261 a, the plurality of metal layers 261 b is evenly arranged atintervals along a straight line, and extension directions of theplurality of metal layers 261 b are parallel to each other, to disposegratings. Optionally, the plurality of metal layers 261 b is disposed ona side of the transparent substrate 261 a. Specifically, a material ofthe metal layer 261 b is selected from one of gold, aluminum, andcopper.

Optionally, the metal layer 261 b has a width of 50 nm to 150 nm; themetal layer 261 b has a thickness of 100 nm to 200 nm; and a spacingbetween two neighboring metal layers 261 b is 100 nm to 200 nm.Specifically, the plurality of metal layers 261 b is rectangular.

Light passes through the reflection grating film layer 261 and may bedivided into an electromagnetic wave whose light polarization directionis perpendicular to an extension direction of the metal layer 261 b andan electromagnetic wave whose light polarization direction is parallelto the extension direction of the metal layer 261 b. The reflectiongrating film layer 261 absorbs or reflects an electromagnetic wavecomponent whose electromagnetic wave vibration component is parallel tothe extension direction of the metal layer 261 b, only anelectromagnetic wave component whose electromagnetic wave vibrationcomponent is perpendicular to the extension direction of the metal layer261 b penetrates, to obtain a function the same as that of thepolarizing plate, and only polarized light perpendicular to a stretchingdirection of the polarizing plate passes through.

The optically-uniaxial optical film layer 262 has optical anisotropy,and when light passes through the optically-uniaxial optical film layer262, a double-refraction phenomenon is generated. Light entering theoptically-uniaxial optical film layer 262 may be equivalent to two beamsof light whose light polarization directions are perpendicular to eachother, and light whose light polarization direction is perpendicular toa liquid crystal optical axis of the optically-uniaxial optical filmlayer 262 is referred to as ordinary light, and is briefly referred toas O light; and light whose light polarization direction is parallel tothe liquid crystal optical axis of the optically-uniaxial optical filmlayer 262 is referred to as extraordinary light, and is briefly referredto as E light.

Optionally, the extraordinary light refractive index (ne) is anequivalent refractive index when an optical axis of theoptically-uniaxial optical film layer 262 is parallel to the lightpolarization direction; and the ordinary light refractive index (no) isan equivalent refractive index when the optical axis of theoptically-uniaxial optical film layer 262 is perpendicular to the lightpolarization direction. The extraordinary light refractive index of theoptically-uniaxial optical film layer 262 is greater than the ordinarylight refractive index of the optically-uniaxial optical film layer 262,that is, ne>no. Specifically, the extraordinary light refractive index(ne) of the optically-uniaxial optical film layer 262 is 1.0 to 2.5.

In an embodiment, an XYZ three-dimensional coordinate system isconstructed, nx is a refractive index of the optically-uniaxial opticalfilm layer 262 in a direction X, ny is a refractive index of theoptically-uniaxial optical film layer 262 in a direction Y, nz is arefractive index of the optically-uniaxial optical film layer 262 in adirection Z, the direction Z is an extension direction of the filmthickness of the optically-uniaxial optical film layer 262, and theextension direction of the film thickness is perpendicular a lightemergent surface of the optically-uniaxial optical film layer 262. Inthis case, ne=nx>no=ny or ne=ny>no=nx, and no=nz. Specifically, amaterial of the optically-uniaxial optical film layer 262 is anematic-phase liquid crystal molecule material.

Referring to FIG. 5, specifically, the optically-uniaxial optical filmlayer 262 includes a plate-shaped portion 262 a and refraction portions262 b.

The plate-shaped portion 262 a is stacked on the reflection grating filmlayer 261. Specifically, the plate-shaped portion 262 a is of atransparent flat-plate structure. Referring to FIG. 6, optionally, apart of the reflection grating film layer 261 is inserted into theplate-shaped portion 262 a.

A plurality of refraction portions 262 b exists, and the plurality ofrefraction portions 262 b is disposed on a side of the plate-shapedportion 262 a away from the reflection grating film layer 261.Optionally, the refraction portion 262 b corresponds to a location ofthe part of the reflection grating film layer 261 inserted into theplate-shaped portion 262 a. Specifically, the plurality of refractionportions 262 b is camber columns.

The refraction portion 262 b has a plurality of side surfaces, one ofthe plurality of side surfaces is an arc-shaped convex surface, and aside surface of the refraction portion 262 b away from the arc-shapedconvex surface is laminated to the plate-shaped portion 262 a.Specifically, the arc-shaped convex surface is a curved surface formedwhen an arc line is moved along an extension direction of the refractionportion 262 b. More specifically, the arc line is a circular arc line.

Optionally, the plurality of refraction portions 262 b is arranged alonga straight line, and extension directions of the plurality of refractionportions 262 b are parallel. Two neighboring refraction portions 262 bare laminated or are disposed at an interval.

Referring to FIG. 7, specifically, the refraction portion 262 b has fourside surfaces, and two side surfaces connected to the arc-shaped convexsurface are parallel, an arc line of the refraction portion 262 b is acircular arc line, and a chord corresponding to the arc line of therefraction portion 262 b is parallel to a bottom surface close to theplate-shaped portion 262 a. A distance between a midpoint of the arcline of the refraction portion 262 b and one of two side surfaces is r1,and a distance between midpoints of arc lines of two neighboringrefraction portions 262 b is P1, where P1≥2r1. When P1>2r1, the twoneighboring refraction portions 262 b are disposed at an interval; andwhen P1=2r1, the two neighboring refraction portions 262 b arelaminated. More specifically, P1≤10 μm, to ensure that at least onearc-shaped convex surface in a sub-pixel enables light to be incidentfrom an optically denser medium to an optically thinner medium and arefraction phenomenon occurs, thereby allocating light energy at a frontviewing angle to a large viewing angle.

R is the radius of a circle on which the arc line is located, and D1 isa maximum thickness of the optically-uniaxial optical film layer 262,where R≤D1. A larger curvature of the arc line indicates a larger rangeof the energy that can be allocated from the front viewing angle to thelarge viewing angle.

It should be noted that when the plurality of refraction portions 262 bis camber columns, the plurality of refraction portions 262 b is notlimited to being arranged along a straight line, the plurality ofrefraction portions 262 b may alternatively be arranged in atwo-dimensional matrix, and two neighboring refraction portions 262 bare disposed at an interval, so as to more effectively allocate lightenergy from the front viewing angle to two-dimensional directions, sothat watching at a full viewing angle is more even.

It should be noted that, referring to FIG. 8 and FIG. 9, the pluralityof refraction portions 262 b is not limited to being camber columns, theplurality of refraction portions 262 b may alternatively be quadrangularprisms, and a side surface of the refraction portion 262 b is laminatedto the plate-shaped portion 262 a. Optionally, the refraction portion262 b corresponds to a location of the part of the reflection gratingfilm layer 261 inserted into the plate-shaped portion 262 a.

Optionally, the plurality of refraction portions 262 b is arranged alonga straight line, extension directions of the plurality of refractionportions 262 b are parallel, and two neighboring refraction portions 262b are disposed at an interval.

Referring to FIG. 10, specifically, the plurality of refraction portions262 b is square prisms, a half of the width of a side surface of therefraction portion 262 b close to the plate-shaped portion 262 a is r2,and a distance between centers of side surfaces of two neighboring prismportions close to the plate-shaped portion 262 a is P2, where P2>2r.Optionally, P1≤10 μm, to ensure that at least one arc-shaped convexsurface in a sub-pixel enables light to be incident from an opticallydenser medium to an optically thinner medium and a refraction phenomenonoccurs, thereby allocating light energy at a front viewing angle to alarge viewing angle. The thickness of the refraction portion 262 b isd2, the thickness of the optically-uniaxial optical film layer 262 isD2, and d2 is not equal to 0, where d2≤D2.

It should be noted that referring to FIG. 11, when the plurality ofrefraction portions 262 b is square prisms, the plurality of refractionportions 262 b is not limited to being arranged along a straight line,the plurality of refraction portions 262 b may alternatively be arrangedin a two-dimensional matrix, and two neighboring refraction portions 262b are disposed at an interval, so as to more effectively allocate lightenergy from the front viewing angle to two-dimensional directions, sothat watching at a full viewing angle is more even.

Referring to FIG. 12 and FIG. 13, specifically, the plurality ofrefraction portions 262 b is square prisms, a half of the width of aside surface of the refraction portion 262 b close to the plate-shapedportion 262 a in a direction X is rx, a half of the width of the sidesurface of the refraction portion 262 b close to the plate-shapedportion 262 a in a direction Y is ry, a distance between centers of sidesurfaces of two neighboring prism portions close to the plate-shapedportion 262 a in the direction X is Px, and a distance between thecenters of the side surfaces of the two neighboring prism portions closeto the plate-shaped portion 262 a in the direction Y is Py, where Px=Py,Px>2rx, and Py>2ry. Optionally, Px≤10 μm, and Py≤10 μm, to ensure thatat least one arc-shaped convex surface in a sub-pixel enables light tobe incident from an optically denser medium to an optically thinnermedium and a refraction phenomenon occurs, thereby allocating lightenergy at a front viewing angle to a large viewing angle. The thicknessof the refraction portion 262 b is d3, the thickness of theoptically-uniaxial optical film layer 262 is D3, and d3 is not equal to0, where d3≤D3. It should be noted that Px is not limited to being equalto Py, and Px may alternatively be greater than or less than Py.

The substrate layer 263 is stacked on a side of the plate-shaped portion262 a close to the refraction portion 262 b, and the plurality ofrefraction portions 262 b is accommodated in the substrate layer 263.The substrate layer 263 is a transparent optical film layer havingoptical isotropy. The substrate layer 263 is made of an organictransparent material or inorganic transparent material. For example, amaterial of the substrate layer 263 is a coating material through whicha planarization structure is made on the photoresist layer.

Specifically, the substrate layer 263 is selected from one of apolymethylmethacrylate layer, a polyethylene terephthalate layer, acyclic olefin polymer layer, a cellulose triacetate film, a polyimidefilm, a silicon dioxide layer, a silicon nitride layer, and a glassplate layer. It should be noted that the substrate layer 263 is notlimited to the foregoing film layer, and an optical film may be used asthe substrate layer provided that the optical film has optical isotropy.

Optionally, an ordinary light refractive index (ns) of the substratelayer 263 is 1.0 to 2.5.

In an embodiment, the ordinary light refractive index (ns) of thesubstrate layer 263 is less than the extraordinary light refractiveindex (ne) of the optically-uniaxial optical film layer 262.Specifically, a difference between the extraordinary light refractiveindex (ne) of the optically-uniaxial optical film layer 262 and theordinary light refractive index (ns) of the substrate layer 263 is 0.01to 2. A larger difference between the extraordinary light refractiveindex (ne) of the optically-uniaxial optical film layer 262 and theordinary light refractive index (ns) of the substrate layer 263indicates easier allocation of light energy from the front viewing angleto the large viewing angle

An operating principle of the optical composite film 260 is as follows:

Light is formed by horizontally polarized (a vibration direction of anelectric field is a direction of 0° or 180°) light and verticallypolarized (a vibration direction of the electric field is a direction of900 or 270°) light, the reflection grating film layer 261 plays a roleof absorbing polarized light and allowing polarized light to penetrate,and when an arrangement direction of the metal layer of the reflectiongrating film layer 261 is parallel to the direction of 900 or 270°, anextension direction of the metal layer of the reflection grating filmlayer 261 is parallel to the direction of 0° or 180°. It is predictedthat vertically polarized light can pass through the reflection gratingfilm layer 261, an equivalent refractive index when the verticallypolarized light passes through the optically-uniaxial optical film layer262 is ne, and an equivalent refractive index when the verticallypolarized light passes through the substrate layer 263 is ns. Due to adifference between the refractive index of the optically-uniaxialoptical film layer 262 and the refractive index of the substrate layer263 (ne>ns), when the vertically polarized light is incident from theoptically-uniaxial optical film layer 262 (optically denser medium) tothe substrate layer 263 (optically thinner medium), refraction isgenerated, and an optical phenomenon in which light energy is allocatedfrom the front viewing angle to the large viewing angle occurs.

When the arrangement direction of the metal layer of the reflectiongrating film layer 261 is parallel to the direction of 0° or 180°, theextension direction of the metal layer of the reflection grating filmlayer 261 is parallel to the direction of 900 or 270°. It is predictedthat horizontally polarized light can pass through the reflectiongrating film layer 261, an equivalent refractive index when thehorizontally polarized light passes through the optically-uniaxialoptical film layer 262 is ne, and an equivalent refractive index whenthe horizontally polarized light passes through the substrate layer 263is ns. Due to a difference between the refractive index of theoptically-uniaxial optical film layer 262 and the refractive index ofthe substrate layer 263 (ne>ns), when the horizontally polarized lightis incident from the optically-uniaxial optical film layer 262(optically denser medium) to the substrate layer 263 (optically thinnermedium), refraction is generated, and an optical phenomenon in whichlight energy is allocated from the front viewing angle to the largeviewing angle occurs. Therefore, the optical composite film 260 not onlycan allocate light energy from the front viewing angle to the largeviewing angle and improve the viewing angle color shift, but also canturn natural light into polarized light, so as to be in place of thepolarizing plate.

The second glass film layer 270 is stacked on a side of the opticalcomposite film 260 away from the second indium tin oxide film layer 250.Optionally, the second glass film layer 270 is stacked on a side of thesubstrate layer 263 away from the optically-uniaxial optical film layer262.

The photoresist layer 280 is stacked between the substrate layer 263 andthe second glass film layer 270.

FIG. 14 and FIG. 15, optionally, the display panel 200 further includesa compensation film layer 290, and the compensation film layer 290 isstacked between the second indium tin oxide film layer 250 and thereflection grating film layer 261; or the compensation film layer 290 isstacked between the first glass film layer 220 and the first indium tinoxide film layer 230. The compensation film layer 290 can be in place ofan optical function of a compensation film in the polarizing plate.Optionally, the compensation film layer 290 has optical anisotropy.Specifically, a material of the compensation film layer 290 is anematic-phase liquid crystal molecule material. More specifically, thecompensation film layer 290 is prepared by using a process of liquidcrystal molecule coating or ultraviolet (UV) light curing.

Referring to FIG. 16, in an embodiment, a quantity of compensation filmlayers 290 is two, one of the two compensation film layers 290 isstacked between the second indium tin oxide film layer 250 and thereflection grating film layer 261, and the other of the two compensationfilm layers 290 is stacked between the first glass film layer 220 andthe first indium tin oxide film layer 230.

It should be noted that referring to FIG. 17, the display panel 200 isnot limited to the foregoing structure. A structure of a display device20 of this embodiment of the display panel 200 is roughly the same asthat of the display device 10 of Embodiment 1, and a difference is thatthe photoresist layer 280 is stacked between the first glass film layer220 and the first indium tin oxide film layer 230.

Referring to FIG. 18 and FIG. 19, optionally, the compensation filmlayer 290 is stacked between the second indium tin oxide film layer 250and the reflection grating film layer 261; or the compensation filmlayer 290 is stacked between the photoresist layer 280 and the firstglass film layer 220.

Referring to FIG. 20, in an embodiment, a quantity of compensation filmlayers 290 is two, one of the two compensation film layers 290 isstacked between the second indium tin oxide film layer 250 and thereflection grating film layer 261, and the other of the two compensationfilm layers 290 is stacked between the photoresist layer 280 and thefirst glass film layer 220.

It should be noted that the display panel 200 is not limited to theforegoing stacking structure, and materials having special functions maybe added to different film layers according to different requirements.For example, another function material is added to a single-functionfilm layer, to obtain a multifunction film layer. In addition, an orderof stacking film layers in the display panel 200 may be changedaccording to a required function, and another function film layer andthe like may be further added according to a requirement.

The foregoing display device 10 has at least the following advantages:

1. The foregoing reflection grating film layer 261 can turn naturallight into polarized light, and is in place of a relatively thickpolarizing plate, to make the display panel 200 relatively thin.Moreover, the optically-uniaxial optical film layer 262 includes aplate-shaped portion 262 a and a plurality of refraction portions 262 b,the plate-shaped portion 262 a is stacked on the reflection grating filmlayer 261, and the plurality of refraction portions 262 b is disposed ona side of the plate-shaped portion 262 a away from the reflectiongrating film layer 261. The plurality of refraction portions 262 b iscamber columns or quadrangular prisms, the substrate layer 263 isstacked on a side of the plate-shaped portion 262 a close to therefraction portion 262 b, the plurality of refraction portions 262 b isaccommodated in the substrate layer 263, and the refractive index of thesubstrate layer 263 is less than the extraordinary light refractiveindex of the optically-uniaxial optical film layer 262. When light isincident from the optically-uniaxial optical film layer 262 to thesubstrate layer 263, based on a difference between refractive indexes,the light is incident from an optically denser medium to an opticallythinner medium and a refraction phenomenon occurs, to allocate lightenergy from the front viewing angle to the large viewing angle, andresolve a problem of color shift of the display panel 200 at the largeviewing angle. Therefore, the foregoing optical composite film 260 notonly can alleviate the color shift of the display panel 200 at the largeviewing angle, but also can make the display panel 200 relatively thin.

2. In the display panel 200, RGB sub-pixels do not need to be dividedinto a main pixel structure and a sub-pixel structure, to avoid designof a metal wire or a TFT element to drive a sub-pixel, which would causea sacrifice in an opening region of transmissible light and affect atransmission rate of the panel. Moreover, display resolution and drivingfrequency of the display panel 200 are maintained. Therefore, theforegoing optical composite film 260 can improve the viewing angle colorshift, and the panel has a relatively good transmission rate.

3. The metal grating film layer 210 of the foregoing display panel 200is in place of a lower polarizing plate, and the reflection grating filmlayer 261 is in place of an upper polarizing plate, to make the displaypanel 200 relatively thin.

It should be understood that the application of this application is notlimited to the above examples, and persons of ordinary skill in the artcan make improvements and modifications accordance to the abovedescriptions, and all such improvements and modifications shall fallwithin the protection scope of the appended claims.

What is claimed is:
 1. A display panel, comprising a metal grating filmlayer, a first glass film layer, a first indium tin oxide film layer, aliquid crystal layer, a second indium tin oxide film layer, opticalcomposite film, a second glass film layer, and a photoresist layer,wherein the optical composite film comprises: a reflection grating filmlayer; an optically-uniaxial optical film layer, comprising aplate-shaped portion and a plurality of refraction portions, wherein theplate-shaped portion is stacked on the reflection grating film layer,the plurality of refraction portions is disposed on a side of theplate-shaped portion away from the reflection grating film layer, theplurality of refraction portions is selected from one type of cambercolumns and quadrangular prisms, and when the plurality of refractionportions is the camber columns, the refraction portion has a pluralityof side surfaces, one of the plurality of side surfaces is an arc-shapedconvex surface, and a side surface of the refraction portion away fromthe arc-shaped convex surface is laminated to the plate-shaped portion;and when the plurality of refraction portions is the quadrangularprisms, a side surface of the refraction portion is laminated to theplate-shaped portion; and a substrate layer, stacked on a side of theplate-shaped portion close to the refraction portion, wherein theplurality of refraction portions is accommodated in the substrate layer,and a refractive index of the substrate layer is less than anextraordinary light refractive index of the optically-uniaxial opticalfilm layer; wherein the metal grating film layer, the first glass filmlayer, the first indium tin oxide film layer, the liquid crystal layer,the second indium tin oxide film layer, the reflection grating filmlayer, the optically-uniaxial optical film layer, the substrate layer,and the second glass film layer are sequentially stacked, and thephotoresist layer is stacked between the substrate layer and the secondglass film layer, or the photoresist layer is stacked between the firstglass film layer and the first indium tin oxide film layer.
 2. Thedisplay panel according to claim 1, wherein the photoresist layer isstacked between the substrate layer and the second glass film layer, thedisplay panel further comprises a compensation film layer, and thecompensation film layer is stacked between the second indium tin oxidefilm layer and the reflection grating film layer; or the compensationfilm layer is stacked between the first glass film layer and the firstindium tin oxide film layer.
 3. The display panel according to claim 1,wherein a quantity of compensation film layers is two, one of the twocompensation film layers is stacked between the second indium tin oxidefilm layer and the reflection grating film layer, and the other isstacked between the first glass film layer and the first indium tinoxide film layer.
 4. The display panel according to claim 1, wherein thephotoresist layer is stacked between the first glass film layer and thefirst indium tin oxide film layer, the display panel further comprises acompensation film layer, and the compensation film layer is stackedbetween the second indium tin oxide film layer and the reflectiongrating film layer; or the compensation film layer is stacked betweenthe photoresist layer and the first glass film layer.
 5. The displaypanel according to claim 4, wherein a quantity of compensation filmlayers is two, one of the two compensation film layers is stackedbetween the second indium tin oxide film layer and the reflectiongrating film layer, and the other is stacked between the photoresistlayer and the first glass film layer.
 6. A display device, comprising abacklight source and the display panel according to claim 1, wherein thebacklight source is located on a side of the display panel.